Rotatable and translatable drawing board



July 2, 1963 Filed Dec.

L. R. HUFF ROTATABLE AND TRANSLATABLE DRAWING BOARD 6 Sheets-Sheet 1 k96 a a? 6 30.

VIII/1119711111110. T 97 99, 107 Z2 25/) 95b "6 9gp BY ATTORNEYS July 2,1963 L, u

ROTATABLE AND TRANSLATABLE DRAWING BOARD Filed D86. 15, 1961 6Sheets-Sheet 2 iiiii/i/Z LESL//QHUFF 9 rxillb- M 9 r1 3 INVENTOR July 2,1963 L. R. HUFF ROTATABLE AND TRANSLATABLE DRAWING BOARD Filed Dec. 15,1961 6 Sheets-Sheet 4 4 w gm 1 3 N u 1m "I! I w 4- 0/ wk #7 a c Y a U BL m um .0 H z 4 n p m n M? Mam 4 w 7 u J M .C/ I am w T ATTORNEYS July2, 1963 L. R. HUFF ROTATABLE AND TRANSLATABLE DRAWING BOARD 6Sheets-Sheet 5 Filed Dec.

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July 2, 1963 3,095,667

L. R. HU FF ROTATABLE AND TRANSLATABLE DRAWING BOARD Filed Dec. 15, 19616 Sheets-Sheet 6 L E 5:. NERHUFF' INVENTOR ATTORNEYS United StatesPatent 3,095,667 ROTATABLE AND TRANSLATABLE DRAWING BOARD Leslie RoyceHail, 266 Mill St., Westwood, N.J.; Hazel Shuman Hull, administratrix ofthe estate of Leslie Royce Hufi, deceased Filed Dec. 15, 1961, Ser. No.159,581 9 Claims. (Cl. 45-131) This invention relates to rotatable andtranslatable drawing boards. The present invention is an improve mentover that in my prior Patent No. 2,894,355, entitled Endless Paper RollType Drafing Board, issued on July 14, 1959. In that prior patent thereare shown two arrangements of drawing boards rotatable about ahorizontal axis, two arrangements of drawing boards that aretranslatable and three arrangements in which the drawing paper isslidable over the drawing board.

The object of the present invention is to provide a drawing board whichis rotatable about a horizontal axis and maintained in any desirableposition by means of adjustable clutches and also translatable to enablethe draftsman to reach a large area of the drawing board, while seatedin an ordinary chair.

Another object of the present invention is to provide a drawing board onwhich the drawing paper is trained over a pair of winding rollers and atension roller to provide for moving the drawing paper across thedrawing board.

A further object of the present invention is to provide a drawing boardwith an arrangement of winding and tension rollers for moving thedrawing paper across the board and in which the rollers are positionedwithin easy reach of the draftsman for right or left handed operation.

An additional object of the present invention is to provide a drawingboard supported on a slidable carriage having an arrangement ofwinding-and tension rollers for moving the paper across the board, inwhich the rollers are removable from the carriage and can be relocatedor placed in storage, either empty or with paper on same.

Still another object of the present invention is to provide a drawingboard supported on a slidable carriage having an arrangement of windingand tension rollers for moving the paper across the drawing board incombination with an elevating means for holding the carriage and drawingboard in a selected elevated position.

An additional object is the provision of an elevating means for holdingthe carriage and drawing board in a selected elevated position thecarriage with the drawing board being rotatable around a vertical axisto the drawing board.

Still other objects, advantages and improvements will become apparentfrom the following specification, taken in connection with theaccompanying drawings, in which:

FIGURE 1 is a topplan view of a desk mounting a drawing board inaccordance with the present invention, with the desk broken away on theopposite sides of the drawing board to show the locations of the windingand tension rollers;

FIGURE 2 is a transverse sectional view, taken on the section line 2--2of FIGURE 1 and looking in the direction of the arrows, showing thereleasable mountings for the winding rollers and the adjusting means'for the tension roller;

FIGURE 3 is a vertical sectional view, similar to FIG- URE 2, showingthe carriage which supports the drawing board shifted forwardly so as tobe free of the rear section of the desk and in a position to be revolvedaround its transverse horizontal axis;

FIGURE 4 is an end elevational view, showing the clutch housings on theopposite sides of the carriage which 3,095,667 Patented July 2, 1Q63supports the drawing board and the guides in which the latter travel;

FIGURE 5 is a partial sectional view, taken on the section line 55 ofFIGURE 2 and looking in the direction of the arrows, showing therotatable mounting of the tension roller;

FIGURE 6 is a vertical sectional view through one of the cone clutchesat the opposite ends of the horizontal shaft, which slidably mounts thecarriage supporting the drawing board, taken substantially along theline 66 of FIGURE 1 as viewed in the direction indicated by the arrows;

FIGURE 7 is a detail vertical sectional view, taken on the line 7-7 ofFIGURE 3 and looking in the direction of the arrows, showing two of thequadruple needle bearings, which rotatably support the cone clutches inthe guide plates;

FIGURE 8 is a detail vertical sectional view, taken on the section line88 of FIGURE 2 and looking in the direction of the arrows, showing therotatable mounting of one of the winding rollers;

FIGURE 9 is a detail horizontal sectional View, taken on the sectionline 9'9' of FIGURE 2 and looking in the direction of the arrows,showing one of the BI-IDS for releasably holding the winding rollers inplace;

FIGURE 10 is a top plan view showing the two parallel screws for movingthe carriage which supports the drawing board outwardly toward the rearof the desk;

FIGURE 11 is a transverse sectional view, taken on the section line11-11 of FIGURE 10 and looking in the direction of the arrows, showingone of the parallel screws for moving the carriage which supports thedrawing board;

FIGURE 12 is a detail longitudinal sectional view, taken on the sectionline 12--12 of FIGURE 10 and looking in the direction of the arrows,showing the clutch shaft housing and one of the slidable blocks, whichare moved by the parallel screws;

FIGURE 13 is a detail transverse sectional view, taken on the sectionline 13- 13 of FIGURE 10 and looking in the direction of the arrows,showing a modification of the needle roller bearings, which mount theclutch housings for linear movement in the transversel positionedguides;

FIGURE 14 is a detail transverse sectional view, taken on the sectionline 14-14011 FIGURE 10 and looking in the direction of the arrows,showing one of the rear mountings, which rotatably support the parallelscrews;

FIGURE 15 is a detail transverse vertical sectional view, taken on thesection line 15--15 of FIGURE 10 and looking in the direction of thearrows, showing one of the front mountings which rotatably support theparallel screws;

FIGURE 16 is a top plan view showing a modification in which thecarriage supporting the drawing board is mounted for movementtransversely of the desk by a slide, which is secured to the carriage,and a guide, Which is secured to the desk;

FIGURE 17 is a top plan view, similar to FIGURE 16, showing a squaredrawing board and slides on the opposite sides of the carriagesupporting same, which slides cooperate with guides secured to the desk;

FIGURE 18 is a transverse vertical sectional view, taken on the sectionline 18-48 of FIGURE 16 and looking in the direction of the arrows,showing a latching device for holding the carriage supporting thedrawing board in any one of several selected positions;

FIGURE 19 is a detail longitudinal vertical sectional view, taken on thesection line 19-49 of FIGURE 18 and looking in the direction of thearrows, showing the details of the latching device and its keeperaccording to FIGURE 18;

FIGURE is a partial end elevational view, taken on the line 2tl20 ofFIGURE 17, and looking in the direction of the arrows, showing therelative locations of the slides on the carriage, which supports thedrawing board, and the guides on the top of the desk, in themodification according to FIGURE 17;

FIGURE 21 is also a partial end elevational view, taken on the line 2121of FIGURE 16 and looking in the direction of the arrows, showing therelative locations of the slides on the carriage, and the guides, whichare mounted on the top of the desk, in the modification according toFIGURE 16;

FIGURE 22 is a horizontal detail sectional view, taken on the sectionline 2222 of FIGURE 20 and looking in the direction of the arrows,showing the relative locations of the slides on the carriage, whichsupports the drawing board, and the guides which are mounted on the topor" the desk, in the modification according to FIGURE 16;

FIGURE 23 is a detail vertical sectional view, taken on the section line23-23 of FIGURE 22 and looking in the direction of the arrows, alsoshowing the details of the slides on the carriage, which supports thedrawing board, and the guides which are mounted on the top of the desk;

FIGURE 24 is a fragmentary side elevational view of the carriage, whichsupports the drawing board, with certain parts shown in section, showinga modified arrangement of the slides on the carriage, which supports thedrawing board, with respect to the winding rollers;

FIGURE 25 is a top plan view of the desk and the carriage, whichsupports the drawing board, with certain parts shown in section andshowing a carriage elevating means;

FIGURE 26 is a side elevational view of the carriage, which supports thedrawing board, and a sectional view of the desk, taken on the sectionline 2626 of FIGURE 25 and looking in the direction of the arrows, andalso showing the carriage elevating means;

FIGURE 27 is a substantially vertical sectional view, taken on thesection line 2727 of FIGURE 26 and looking in the direction of thearrows, showing the pivoted end of the elevating means and a detent forlatching the carriage, which supports the drawing board, from slidingmovement;

FIGURE 28 is a detail side elevational view showing the pivoted end ofthe carriage elevating means, and the detent for latching the carriagetaken substantially along the line 28-28 of FIGURE 27 as viewed in thedirection of the arrows;

FIGURE 29 is a detail transverse sectional view, taken on the sectionline 2929 of FIGURE 25 and looking in the direction of the arrows,showing a modified arrangement of one of the cone clutches, which arepositioned between the carriage supporting the drawing board and aslidable block arranged for travel along one of the parallel screws;

FIGURE 30) is a detail longitudinal sectional view, taken on the sectionline 3tl30 of FIGURE 2 9 and looking in the direction of the arrows,showing the attachment of the cone clutch according to FIGURE 29 to theslide, which supports the drawing board, and the guide on the top of thedesk;

FIGURE 31 is a detail horizontal sectional View, taken on the sectionline 3131 of FIGURE 26 and looking in the direction of the arrows,showing a latch for holding the carriage, which supports the drawingboard, against sliding movement along the desk top;

FIGURE 32 is a detail substantially vertical sectional view, taken onthe section line 32-32 of FIGURE 28 and looking in the direction of thearrows, showing the hinge and hinge pin for tilting the carriage, whichsupports the drawing board;

FIGURE 33 is a detail partial transverse sectional view, taken on thesection line 3333 of FIGURE 25, and

I looking in the direction of the arrows, showing the rear pivotedmounting for the carriage, which supports the drawing board;

FIGURE 34 is a side elevational view, similar to FIG- URE 26, butshowing the hinged carriage, which supports and elevates the drawingboard, in the lowered position;

FIGURE 35 is a top plan view, taken on the section line 35-35 of FIGURE34 and looking in the direction of the arrows, showing the mounting ofthe carriage, which supports the drawing board, for rotation about itsvertical axis;

FIGURE 36 is a detail transverse sectional view, taken on the sectionline 3636 of FIGURE 35 and looking in the direction of the arrows,showing the details of the mounting for the carriage, which supports thedrawing board, for rotation about its vertical axis;

FIGURE 37 is a detail transverse sectional view, taken on the sectionline 37-37 of FIGURE 35 and looking in the direction of the arrows,showing the details of the slidable mounting for the carriage, whichsupports the drawing board, according to FIGURE 35;

FIGURE 38 is a detail transverse sectional view, taken on the sectionline 3838 of FIGURE 35 and looking in the direction of the arrows,showing the locking means for securing the rotatable mounting of thecarriage, which supports the drawing board in any selected position; and

FIGURE 39 is a schematic top plan view, showing that the carriage, whichsupports the drawing board, must first be pulled forward before it canbe rotated about its vertical axis and into the desired angularposition.

Referring now to the drawings in detail, and to FIG- URES 1 and 2 inparticular, the drawing board and the slidable carriage, which supportssame, are here shown as mounted within the parallel sides and over anintermediate section of a desk. The lower section of the desk may be ofany conventional construction. As shown, the lower section of the deskis comprised in part by front corner members 10, which are of angle barshape. These corner members form legs (not shown) and are spaced apartlongitudinally to provide an open space for the draftmans knees. Anintermediate wall 11 is positioned parallel to the front corner membersIt} and rear corner members 12 are also provided. These rear cornermembers 12 are likewise of angle bar construction and form legs (alsonot shown) at their bottoms. Side frame members 13 are provided acrossthe tops of the front corner members It) and across the tops of the rearcorner members 12 for supporting the top. End walls 15 are provided andare secured over the corner members 10 and 12 and against the ends ofthe intermediate wall 11. A rear wall 16, similar to the end walls 15,is also provided and is positioned between the rear corner members 12.

Side frame members 14 are mounted on the tops of the front cornermembers 1tl1tl and rear corner memhers 1212. A top is comprised in partby a solid plate 17, which is supported by the intermediate wall 11, theend walls 15 and the rear corner members 12-12. The end walls 15 arerabbeted into the top plate 17 at 17a as shown in FIG. 5. Between theend frame members 1313 and between the intermediate wall 11 and thefront side frame member 14, the top is open as shown in FIG. 3.

As shown in FIGURES 3, 4 and 5, a super structure is provided forpartially enclosing the carriage, to be later described, at its sides.This super structure is comprised in part by sills 22 22, which arepositioned on the top plate 17 and the end frame members I313. (See FIG.2.) End walls 23-23 are vertically aligned with the end walls 15l5,respectively, of the main lower section of the desk and are rahbetedinto the top plate 17 at 1712. Wings or side extensions 24-24- aremounted on the end :walls 2323 of the super structure, and the end walls23- 23 are rabbcted into the wings on the under sides of the latter at24a.

The carriage is comprised in part by a bottom plate 30, which isslidable over the top plate 17 and the intermediate wall 11 on the mainlower section of the desk. A rear plate 31 may be integrally formed withthe bottom plate 30, or as a separate element and attached thereto inany suitable manner. This rear plate 31 has an inturned horizontalflange 31a at its top. Side plates 23 are positioned on the sills 22.

Bearing brackets 38 (see FIGS. 3 and 4) are positioned inwardly of theside plates 23. Along their tops these bearing brackets areformed withoutwardly turned flanges 38a. At their front ends and adjacent theirrear ends these bearing brackets are also formed with integral legs3812, which in turn are formed at their bottoms with outwardly extendingtoe flange-s 380. The latter are secured to the bottom plate 30 of thecarriage by bolts or machine screws 39. Also, at their rear ends thebearing brackets are formed with inturned right angle flanges 38d, thelatter underlying the inturned flange 31a on the rear plate 31. Theserear flanges 38d terminate in a downwardly and inwardly positioned web158e, which latter is parallel to the rear plate 31.

The drawing board is shown at 40 and the paper trained .thereover at 48.To secure the drawing board in place,

screws 41 extend through suitable holes in the upper flanges 38a on thebearing brackets and into the drawing board.

The tensioning roller is shown in FIGURES 2, 3 and 5. This roller isrotatably mounted at the rear of the drawing board 40. This roller iscomprised principally by a cylindrical tube 50. At each end of this tube50 there are formed diametrically disposed recesses 51 in the side wallof the latter, which recesses are rectangular in cross section. Circularend plates 52 are received over the ends of the tube 50 and these endplates have diametrically positioned tongues 53 thereon, which arereceived in the recesses 51 in the ends of the tube. Stub shafts 54 aremounted centrally of the end plates 52 and these stub shafts areslidably mounted in slots (not shown) in the bearing brackets 38, whichslots extend longitudinally of the brackets. Spacer collars 55 arepositioned between the end plates 52 and the legs 38b. These may be two(2) part semi-cylindrical collars with a suitable central hole thereinfor receiving the stub shafts 54. The complementary halves of thesemicylindrical collars are held together by either a split metal band56, or by adhesive tape wrapped same. Beyond the legs 38b of the bearingbrackets the stub shafts 54 pass freely through slidable blocks 58.These latter are held in place on the legs 38b of the bearing bracketsby angle members 59 which have machine screws 60 securing their bottomflanges to the legs with their top flanges 59a holding the blocks 58against the legs. Rods 61 are rotatably secured to the slidable blocks58 and are received in suitable screw threaded holes 38c in the webs 38don the bearing brackets. At their outer ends these rods 61 carry knobs63, which knobs have hubs 63a rotatably received in suitable holes 36 inthe rear plate 31 of the carriage. Coiled compression springs 62surround the rods 61 and at one end abut the webs 38d on the bearingbrackets and at their other ends the hubs 63a of the bearing brackets.

The rear winding roller is shown in FIGURE 8. It is comprised in part bya mandrel in the form of a hollow tube 65. An outer hollow cylinder 68,which may be of fiber, freely surrounds the mandrel =65. Collars 68 arereceived on the mandrel 65 and about the outer hollow cylinder 66 at itsopposite ends. These collars 68 are held in position by radiallypositioned set screws 67. At each end of the mandrel there are formeddiametrically disposed recesses 69, which recesses are rectangular incross section. Circular end plates 70 are received over the oppositeends of the mandrel 65, and these end plates have diametrically disposedtongues 71 thereon, which 'are received in the recesses 69 in the endsof the mandrel.

Axles 72 are positioned centrally of the end plates 70 and are receivedin inverted U-shaped notches 42 in the under sides of the bearingbrackets 38. Coiled compression springs 73 surround the axles 72 andabut at one end the circular end plates 70 and at their other ends thebearing brackets 38. On one of the axles 72 there is mounted a handwheel 74 for rotating the winding roller 66. For right hand operationthis hand wheel will be on the right axle 72, as shown in FIGURE 4, andvice versa for left hand operation.

A releasable bearing support is provided for holding the axles 72 inplace in the U-shaped slots 42 in the bearing brackets 38, as shown inFIGURE 8. These axles 72 are freely received in apertures 43 whichextend through short levers 76, the apertures 43 extending along thetransverse center line of the levers 76. The levers 76 are U-shaped incross section and receive the lower sides of the bearing brackets 38, asshown in FIGURES 9 and 2. At one end the levers 76 are pivotally mountedon the bearing brackets 38 by short bolts 75, at their other ends theyare formed with U-shaped slots 77 along their longitudinal center lines.Arms 81% have cam ends 8%, which are received in the U-shaped slots 77in the levers and are pivotally mounted in the bearing brackets 38 byshort bolts 79, which have wing nuts 81 on their outer ends. It will beapparent that upward movement of the arm 80, as viewed in FIGURE 2, willswing the lever 76 downward and thrust the axle 72 from the slot 42 inthe bearing bracket 38 and that the rear winding rollers 65 and 66 maythen be removed by disengaging the circular collar 70 and compressionthe spring 73 towards the bearing brackets 38; conversely, downwardmovement of the arm will swing the lever 76 upward and securely latchthe axle 72 in the slot 42 in the bearing bracket 38 to give suflicientthrust to prevent rotation of the rollers 65 and 66.

The front winding roller is shown at 82 (FIGURES 2, 3 and 4). This maybe a fiber cylinder or a metal cylinder encased by a fiber sleeve. Thelatter construction is shown in FIGURE 24, which construction issubstantially identical with the rear winding roller, previouslydescribed. As shown in the latter figure, the hollow metal cylinder 82is a mandrel and is freely surrounded by a hollow outer cylinder 86,which may be of fiber. At each end of the mandrel 82 there are formeddiametrically disposed recesses 83, which recesses are rectangular incross section. Circular end plates 85 are received over the oppositeends of the hollow cylinder 82 and these end plates have diametricallydisposed tongues 84 thereon, which are received in the recesses 83 inthe ends of the mandrel 82. Collars (not shown) identical to collars 68also surround the mandrel 82 and abut the outer hollow cylinder 86 atits opposite ends. These collars are similarly held in place by radiallypositioned set screws. Axles 89 are positioned centrally of the endplates 85 and are received in inverted U-shaped slots '42 in the undersides of the bearing brackets 38. On one of these axles 89 there ismounted a hand wheel 96 for the forward winding roller. Like the handwheel 74 for the rear winding roller 66, this hand wheel is positionedon the right, as viewed in FIGURE 1, for right hand operation. Thereleasable bearing sup-port for the tront winding roller 86 is identicalwith that for the rear winding roller 66, as is the associated spring(not shown).

The drawing paper 48 is trained over the rear winding roller 66, thetension roller 50, the drawing board 40 and the front winding roller 86.It may be secured to the winding rollers 66 and 86 in any suitablemanner, as by drafting tape or paper cement.

An elevating means is provided for raising the carriage to an inclinedposition if desired, and without shifting same forwardly as shown inFIGURES 2 and 11. This means is comprised by a lifting bar 90 having alongitudinal slot 93 adjacent one end and an approximately right angleflange 90a at the other end. The flange 90a underlies the bottom plate30 of the carriage at the rear of the latter. A screw 94 having a locknut'94a therein passes through the slot 93 and is received in aninternally threaded cylinder 95, which latter is secured to the rearwall 16 of the lower sections of the desk. This elevating means may bepositioned along the vertical center line of the rear wall 16 of thedesk, or may be provided in duplicate and the cylinders 95 secured tothe rear corner members 16. A levelling strip 18, of the same height asthe thickness of the flange 99a on the arm is provided across the top ofthe desk, in vertical alignment with the intermediate wall 11.

In order to elevate the carriage through the elevating means justdescribed, the carriage is shifted slightly rearwardly, until the frontend of the bottom plate 31 is inside the front corner members 1(i-1tl.The carriage may then be tilted in the counter-clockwise direction, asviewed in FIGURE 2, and held in such position by setting the bar 90 inthe selected position and clamping same by the screw 94.

FIGURE 6 shows an arrangement in which the carriage is supported formovement on a track and a clutch is provided for holding the carriage inany selected position. On each side of the carriage a channel memberhaving a wall or web 96 is secured to the side plate 23 of the desk bybolts 97. The channel member has upper and lower flanges 96a and 96b,respectively, thereon, which are recessed at 99 adjacent their junctureswith the web 96. An outer plate 1% travels in the upper and lowerrecesses 19 and an inner plate 164 over the faces of the flanges 96a and96b. The plates 1% and 1124 are held in assembled relationship by bolts162 having nuts 163 thereon, which bolts pass through spaced holesadjacent the circumferences of the plates. An outer frustoconical clutchmember 106 has flanges at its opposite ends, which flanges also havearcuately spaced holes therein for receiving the bolts 1112. An innerfrusto-conical clutch member 167 has a cylindrical boss 167a on itsouter face and an integral axially positioned shaft 1118 on its innerface. The cylindrical boss 167a is slidably received in an axial hole101 in the outer plate 160 to provide bearing support. The inner plate194 also has an axial hole 195 therein and a flanged bushing 109 has itshub 1119a received in this hole. Between the inner face of the innerclutch member 167 and the bushing 109, and surrounding the shaft 108,there is mounted a compression spring 110. The shaft 168 is threaded atits mid-section at 108a and reduced in diameter at its outer end at1138b.

The bottom plate 30 is here mounted in horizontal parallel relationshipwith the drawing board 40 by brackets 25 which have upper and lowerflanges 25a and 25b, respectively, thereon. These flanges are secured tothe bottom plate 30 and the drawing board 40 by screws 26. At theirmid-section the brackets 25 have bosses 27 with axial bores therethroughin which the outer ends 1118b of the shafts 198 are slidably received.The bores through the bosses '27 are each formed with a key way 28 inwhich a key 111 on the outer end of the shaft 108 is received toconstrain the shaft against rotation. It will be apparent that the outerends 1081) of the shafts could as well be made square and complementarysquare holes formed through the bosses 27. A hand wheel 112 has a screwthreaded bore through its hub by which it is rotatably mounted on thescrew threaded mid-section 108:: of the shaft 108. The hub of the handwheel also has a circumferential groove 112a therein. An arcuateretainer plate 114 is secured by screws 113 to the boss 27 on thebracket 25 and has a flange 114a thereon which is received in the groove112a in the hub of the hand wheel to constrain the latter against axialmovement.

It will be apparent that the hand wheel 112 may be rotated in thecounter-clockwise direction, as viewed from the left in FIGURE 6, todraw the inner clutch member 167 inwardly and compress the spring 110.The carriage may then be slid either forwardly or rearwardly, the outerplate 116 travelling in the recesses 99 and the inner plate 104travelling over the faces of the flanges 96a and 96b. When the carriagehas reached the desired position, the hand wheel 112 may be rotated inthe opposite direction to move the inner clutch member 167 intoengagement with the outer clutch member 186, the compression springbeing released and holding the clutch members in engagement.

The arrangement according to FIGURE 7 differs from that according toFIGURE 6 in two features. The outer clutch member 106 is here replacedby a plurality, at least four (4-) closed end cylinders 115, which arearcuately spaced around the inner plate 98a and the outer plate 163.These cylinders have aligned axially positioned holes 116 in theiropposite ends, through which the bolts 1G2 pass. Within each cylinderthere is a plurality, preferably four (4) roller bearings 117, whichsurround the bolts 102. These roller bearings have conical or needleends 117a, which are guided by the ends of the cylinders 115. Thesecylinders rotate on the bolts 192 as axles and between the flanges 96aand 96b (see FIG. 6) of the channel or track member 96 and the outerclutch member 106. This arrangement has the advantage that the upperroller beanings 117 on the opposite sides of the drawing board 451prevent any twisting action by the clutches. If desired, separate plates(not shown) screwed to wings 24 and the sills of plate '30 may serve astracks for the bearings. The outer conical clutch memher 106 as shown inFIGURES 3 and 6 also has flanges at its opposite ends for receivingbolts 102.

Another feature of the arrangement according to FIG- URE 7 is that theouter ends 10317 of the clutch shaft have separate mountings from thebearing brackets 38 which support the drawing board 45) and bottom plate80. Pedestals 118 have toe flanges 2118b at their bottoms and aremounted on bottom plate 30 by cap bolts 119. At the tops of thepedestals 118 there are integral bosses 118a having axial bores thereinin which the outer ends 1022b of the clutch shaft are slidably mounted.The bottom plate 30 is wider than shown in the arrangement according toFIGURE 6 to provide space for the pedestals 118. This arrangement hasthe advantage that the bearing brackets 38 are separated from thepedestal mountings 118 for the carriage. The drawing board 40 and thecarriage may accordingly be removed and replaced without removing thepedestal 118, hand wheel 112 or the clutch 107.

In FIGURES 10 to 15, inclusive, there is shown a modification in whichtwo (2) parallel screw threaded shafts are provided for shifting thecarriage transversely of the desk. As here shown the bottom plate 30 hasa partial top plate 31a at the rear, which is on the same level as thewings 2424. The channel members 96-6 are here mounted between the wings24- and the sills 22.

The roller bearing mounting for the clutches is shown in FIGURE 13. Theinner plates 100 of the clutches in FIGURE 6 are here replaced byrectangular plates 129, which have inwardly offset extensions 120d ofreduced width at their forward ends. The outer clutch member 106 ofFIGURE 6 is here replaced by a clutch member 121 which is cylindrical onits outer surface. Cylinders 123 roll between the upper and lowerflanges 96a and 96b of the channel members 96. These cylinders arerotatably mounted around the outer clutch members 121 by roller bearings122 which are similar to the roller bearings 117 of FIGURE 7. On theinwardly offset extension 120d of the plate 120 there are mounted rollerbearings 125 on shafts 124. These roller bearings run respectively onthe flanges 96a and 96b of the channel member 96. Their purpose is toprevent rotation of the outer clutch member 121. Bolts 102 extendthrough outer clutch member 121, inner rectangular plates 120 and anouter plate (not shown) substantially identical to plate 104 (see FIG.6) form an integral unit.

As shown in FIGURE 12, the outer ends of the shafts 10815 are herereceived in bores 127 in pedestals 128. The bores 127 have keyways 126therein for the reception of the keys 1 11. At their bottom thepedestals 128 have outturned flanges 128a. The flanges 128a rest onslides 130 and are secured to the latter by bolts 131. These slides 130are slidably received under the flanges 132a of guide members 132. Thelatter are secured by screws 133 to the bottom plate 30 of thesuperstructure.

The pedestals 128 have screw threaded bores 129 therein in which arereceived elongated screw threaded shafts 135. As shown in FIGURES 1'1and 14 these shafts are reduced in diameter at their outer ends at 135aand are rotatably mounted in brackets 136136 at the opposite sides ofthe bottom plate 30 of the carriage. The brackets 136-136 have rightangle bottom flanges 136a by which they are secured to the bottom plate36 of the carriage by screws :137, which pass through the guides 132. Asthus mounted, the brackets 136136 thrust the clutch to the top of thedesk. Collars 140 are secured on the reduced ends 135a of the shafts byradially positioned set screws 139 and these collars abut the brackets136-436 to hold the shafts against longitudinal movement. By shiftingthe positions of the clutches 125 relative to the bottom plate 30, thedrawing board =40 as shown in FIG. 11 may be elevated to a desired angleor vertical position to suit the draftsman.

The two shafts 135-135 are interconnected by a chain 144, (see FIG. 10)which runs over chain gears 142-142 on the inner ends of the shafts.These chain gears are held in place by vertically positioned set screws143 through their hubs 142a. At their outer ends the shafts 135 areformed in square sections 1351). A hub crank 145 may be placed on eitherend of either shaft 135 for rotating the latter and moving the carriagetransversely of the desk. The rear plate 31 has a hole 32 therein forreceiving the thumb of the hand crank 134a.

The brackets 136136 for the screw threaded shafts -135135 are mountedabove and in parallel relation to the guide 132, as in the arrangementaccording to FIG- URE 11.

As shown in FIG. 11 the axles 72 of the tensioning roller 50 are held inplace by U-shaped slots in the hearing bracket 38, short levers 76 andarm 8%) as disclosed previously in FIGURES 8 and 9.

In the species of FIGURE 16 there is shown an arrangement which isparticularly adaptable to a square drawing board. In this arrangementthe slides 13!) are secured directly to the toe flanges 380 on thebearing brackets 38 of the carriage and the guide 133 is secureddirectly to the bottom plate of the carriage by screws 152.

As shown in phantom lines the carriage can be pulled forwardly over thebottom plate and beyond the stationary desk top 17. In such position thecarriage is conveniently located for removal or replacement of thewinding rollers 66 and 82 and the tensioning roller 50'. Also, in suchposition the draftsman can conveniently draw from either side board, aswell as from the front.

The arrangement shown in FIGURES l7 and 20' is also particularlyadaptable to a square drawing board 40 mounted in bearing brackets 38and toe flanges 380. In this arrangement the carriage is also providedwith slides 130 along its longitudinal center lines. Only two guides 136are used as before. With this arrangement the carriage may be removedfrom the desk top 17, over the bottom plate 20, rotated through 90degrees and then replaced on the desk top. The carriage is shifted fromone position to another by pulling it forward, turning through 90degrees and then pushing it rearwardly to the full line position asshown. The drawing board 40 may then be positioned as the draftsman maylike and to suit principally the length of the drawing. It is of courseeasier to work a long drawing from the sides but there are exceptionsand the present arrangement provides as well for working a long drawingfrom the ends, if desired.

The arrangement shown in FIGURE 18 is distinguished from those alreadydescribed by several features. The bearing brackets 38 of the carriagehas four (4) notches 42 therein for its axles 54, 72 and 89 of thewinding rollers 66 and 82 and the tensioning roller 50 formed in pairswith the notches of end pair uniformly spaced and the pairs uniformlyspaced from the ends of the carriage. With this arrangement both windingrollers 66 and 82 may be placed near the front of the carriage and thetensioning roller 50 near the rear of the carriage, as shown, or viceversa.

According to the construction of the desk here shown, the superstructure is complete between the wings 2424. The latter includes abottom plate 20, which rests on the top plate 17 of the desk. There isalso a rear plate 31, which is aligned with the rear wall 10 of thedesk. Corner rods are secured to the bottom plate 20 and the rear plate31 by bolts or pins 34. The guides 133 are secured to the bottom 21 byscrews 152, as shown in FIG. 19.

A latch 154 is provided for holding the carriage in any one of severalselected positions along the guides 133-433, as may be desired. Thislatch is shown in position on the carriage and the super structure ofthe desk in FIGURE 18 and in detail in FIGURE 19. An angle bar 148 issecured to the top of one of the slides 1130 by bolts 149. This anglebar has longitudinally aligned holes 151} in its upstanding flange. Aright angle bracket 32a is secured to the bottom plate 20 of the superstructure by screws 153. This bracket has a hole in its upstandingflange adapted to align with the holes 150 on the upstanding flange ofthe angle bar 148. An L-shaped pin 154 is inserted in the aligned holesin the upstanding flanges of the angle bar and the bracket. As shown inFIGURE 18, the holes 150 in the upstanding flange of the angle bar 148'may be replaced by, or sup plemented with holes 151 in the toe flanges38c of the bearing brackets 38, if desired.

The angle bar 148 is attached between the toe flanges 380 to the slides134 by rivets 149 (see FIGURE 19).

In FIGURE 2 4 there is shown an arrangement in which the slides 132 aremounted transversely of the carriage. They are secured to the latter bybolts 155 which extend through suitable holes in the toe flanges 38a onthe bearing brackets 38 and have nuts 156 therein. This arrangement isparticularly adapted to the carriage where the latter is made square intop plan view. In such case, the slides 132 may also be mountedlongitudinally of the carriage, using the same holes in the toe flanges38a and the same bolts 155. This latter position of the slides 132 isshown in phantom lines in the same figure. The advantage of thisarrangement is in the making of a drawing that is the same or a lesserlength than the rollers, instead of making a drawing on a long sheet ofpaper wound on the rollers and turning the board through 90 degrees. Inthis case the views on the two drawings will have the same relativepositions. However, the rear winding and tension rolls may be added andsupported in the U slots in the bearing bracket 38.

In FIGURES 25, 26, 27, 28, 32 and 33 there is shown an arrangement fortilting the carriage and drawing board, which is alter-native to orcombined with the tilting means shown in FIGURE 3. The guides 132132 aremounted on a hinge plate 157 beneath the carriage, as shown in FIGURES27, 28 and 32. At the inner end of this plate 157 there is secured by arivet 158- a hinge 159 having a pivot pin 160-. The complementary leafof this hinge is in the form of an elongated plate 162 which is securedto the bottom 20 of the central section of the super structure by screws161. At the opposite of the plate 162, adjacent the rear wall of thesuper structure, this plate is formed with a loop 163. (See FIGURE 26.)A rod 164 has .a right angled, lower end, which is pivotally secured inthe loop 163. At the outer end of the guide 132 there is mounted anoffset bracket 165,

and one arm of this bracket being secured to guide 132 and the other armhaving a hole therein for receiving the main body of the rod 164. Ascrew threaded hole is formed in this latter arm at right angles to thehole which receives the rod 164. A set screw 166 is received in thescrew threaded hole in the arm of the bracket 165 and has a knob 167 onits outer end (see FIGURE 25).

As best seen in FIGURE 27, the angle bracket 163 of the latch 154, whichis similar to the arrangement disclosed at 32a (FIGURE 19) is secured tothe bottom 20 of the super structure, is replaced by an angle bracket168 which has a right angle flange 168a at its bottom and a boss 16812at its top. The flange 168a is received under the guide 132 with thehinge plate 157 and held in place by the screws or rivets 158. The boss16%!) has a hole therethrough, which is adapted to relatively align withthe holes 151 in the toe flanges 3:30 of the bearing brackets 38 andangle iron 14% to receive the L-shaped pin 154. The angle irons 148support the toe flanges 380 of the bearing bracket 33.

In the arrangement according to FIGURE 33, the loop 169 at the rear endof the elongated plate 162, as shown in FIG. 26, is replaced by a secondhinge loop 1'71 having a pivot pin 170 therein. The central butt of thehinge comprises a plate 171]) in which latter there are formed holes atright angles for riveting to the rod 164. One hole diametricallypositioned in a boss 171a. receives the depending rod 164. The otherhole is axially positioned in the boss and receives a beaded set screw172.

With the carriage and drawing board held in the elevated position by thehinge 159 and rod 16%, as shown in FIGURE 26, the carriage may be pulledoutwardly without disturbing such positions. In addition to the featuresof elevating the drawing board, the carriage can be elevated and held inposition by the clutches 176. Also, the carriage and drawing board maybe pulled forward, as in the previous modifications, with or withoutelevating the carriage, as indicated in dotted lines in FIG. 26.

In FIGURE 26 there is also shown an alternative manner of training thepaper 48 over the front and rear winding rollers 66 and 82,respectively, and the forward tensioning roller 56 as shown, the paper48 is trained under the forward winding roller 66, over the rear windingroller 32, and under the forward tensioning roller and over the drawingboard 40 and wound on roller 82. This manner of training the paper overthe rollers keeps the paper taut at all times and prevents excessiveslack when either of the wind-ing rollers are turned. It should be notedthat, if the paper is kept taut at all times, the shifting of samesideways will be practically eliminated.

In FIGURES 29 and 30, there is shown still another alternative form ofthe clutch and this clutch is used in the arrangement according toFIGURE 6. Guides 174 are mounted on the sills 22 of the super structureby screws 173. These guides are similar to the guides 132 fastened tothe bottom 26 of the super structure. By screws 173 slides 175 areslidably mounted in the guides 174. An outer clutch member 1'76, havingflanges at both ends and a 'frusto-conical inner surface, is secured toeach slide 175 by bolts 177 at toe flanges 176a. An inner frusto-conicalclutch member 178 is received within the outer clutch member 176. Innerand outer plates 180 and 182, respectively, are secured over the outerclutch member 176 and held in place by bolts 189a, which extend throughaligned holes 189 in the plates and the flanges of the outer clutchmember 176. The inner clutch member 178 has on its face a guiding boss178a, which slides and is received in a central hole 183 in the outerplate 182. On its other face the inner clutch member has an integralcentrally positioned shaft 17811, which slides and is received in acentral hole 181 in the inner plate 180. A coiled compression spring 185is positioned between the inner clutch member 178 and the outer plate182, surrounding the guide 1780.

Pedestals 186 which are similar to the pedestals in FIGURE 12 haveoutwardly extending flanges 186a at their bottom. These pedestals 186are secured by bolts 13% which extend through aligned holes in theflanges 136a and the slides 132a. The pedestals 186 have transverse.yextending screw threaded bores therein, which receive the screw threadedshafts 135. Each pedestal has an axially extending bore 187 therein anda keyway along their bore. A key 188 is secured in a complementarykeyway in central shaft 17% of the inner clutch member and constrainingthe latter against rotation. A plate 1% having a central hole therein issecured over the outer face of each pedestal by machine screws 189. Inthe plate there is rotatably mounted a shaft 192, which has an innerscrew threaded end 179a received in an axially positioned screw threadedbore 192 in the central shaft 17311 on the inner clutch member. Theshaft 192 also has an integral disc 193 therein, which is positioned inan counterbore 187a in the pedestal and abuts the plate on the innersurface of the latter. A handwheel 195 is secured in the outer end ofits shaft 192 by a key 196, in a keyway 196a.

In the type of cone clutch here described the disc 1% rotating in thecounterbore 1370 in the pedestal takes up the thrust load on the clutch.This thrust load is opposite to that on the clutch described inconnection with FIGURE 6, and places the bottom plate 313 of thecurriage in compression, while the thrust load of the clutch of FIG. 29places the bottom plate 2% in tension thereby tending to force the edge1b of the sill 22 against the edge 1a of the bottom plate 2% asassistance in preventing rotation and holding the carriage in place asshown in FIG. 3.

In FIGURE 31 there is shown a latch for holding the central section ofthe super structure in place. As shown by the arrow in FIGURE 26 thiscentral section can be tilted upwardly above the clutches 176-476 or bypivots 159. At one corner of an end strip 21, which is on the front ofthe bottom plate 20 of the central section of the super structure, thereis formed a right angled recess by a large diameter bore, which extendslongitudinally of the bottom 20, and a smaller diameter bore, whichextends transversely of the bottom and intersects the first bore. Akeeper in the form of a bushing 291 is mounted in a bore in either theadjacent front corner member 10 or the inner end wall 15 of the desk.The movable element of the latch (see FIGURE 10) is a detent in the formof a right angled pin 204, which has one arm in the lengthwise extendingbore and the other arm in the transversely extending bore. A collar 2%is force fitted on the latter arm and this collar is slidably mounted ina bushing 293, which is force fitted in the transversely extending here.It will be obvious that the pin 2% may be pulled transversely of thebottom it? in recess 2% to clear the adjacent end wall 15, the centralsections of the super structure may be swung upwardly, in the directionindicated by the arrow in FIGURE 26, employing the clutches 176-176 aspivots and the pin pushed outwardly to engage in the bushing .531 andhold. the bottom 20 of the super structure in the elevated position. Thekeepers 201 may be provided at spaced locations along the end walls 15,or the front corner members it to hold the central section of the uperstructure in any one of several elevated positions, as may be desired.Also, the latch may be provided on i both sides of the bottom it. of thecentral sections of the super structure to make the central section morestable in any one of the elevated positions.

In FIGURES 34, 35, 36, 37 and 38 there is shown an arrangement in whicha circular drawing board is rotatable on the carriage. The clutches,slides and guides, hinges and latch are the same as in the arrangementsaccording to FIGURES 25, 26, 27 and 28. As shown in FIGURE 35, thecarriage is supported by two inverted L-shaped longitudinally extendingbars 265-205, which speaser have right angle extensions 265a at theirouter ends. In FIGURES 36 and 37 it will be seen that these bars haveouter flanges 205b, which flanges are cut away across the right angleextensions 205a to leave extensions 205d of the horizontal flanges.These extensions are secured to the slides 130 by bolts 131 havingsuitable nuts therein, which bolts are received in aligned holes in theextensions and the slides, the L-shaped bars 168 being secured to theslides 130.

A double walled annular plate 206, which is channel shaped around itscircumference to form upper and lower flanges 206a and 206b,respectively, and which may consist of two half sections 206e and 296and is rotatably mounted on the longitudinally extending bars 205205 andthe L-shaped bars 168 as shown in FIG. 36. This plate is constrained inits circle of rotation by stud bolts 207, only one of these being shownbut three or four being preferably provided. These stud bolts 207 arereceived in screw threaded holes in the top flanges of the bars 205,have nuts 208 therein and washers 269 beneath the nuts. The washers 209grip the outer edge of the lower flange 20612 on the annular plate 206,which rests on the supporting bars 205--205 and L bars 168 168.

As shown in FIGURE 35 one setof the stud bolts 297 and washers 208 ishere replaced with a cam 213a, are provided on the rear longitudnial bar205 and to the right of the transverse center line. Other sets willpreferably be provided on both the front and rear longitudinallyextending bars 205205 and symmetrically positioned on the opposite sidesof the transverse center line to constrain the annular plate.

In the alternative arrangement according to FIG- URES 34 to 37 the frontand rear longitudinally extending bars 205-205 may be replaced by asquare supporting plate 210, which has a downwardly extending flange210a and an upwardly extending flange 21Gb similar to the L bars 168,the plate 210 being above and .secured to the slides 130. With thisarrangement the annular plate 206 is entirely supported in its circle ofrotation by the plate 210 and constrained by the stud bolts 207, nuts208, and washers 26%.

The plate 210 may also have an inside upwardly extending circular flange213 to match the inside diameter of the annular plate 286. This circularflange 213 also constrains the annular plate in its circle of rotationwith assistance of bolts 207, nuts 2-08 and washers 209.

Rectangular plates 212, which have one corner cut away, are secured bybolts or rivets 211 to the upper flange 206a of the rotatable annularplate 206. There are preferably four (4) of these annular plates, spaced90 degrees apart. The toe flanges 38 on the bearing brackets 38 of thecarriage are secured to these brackets by the bolts or machine screws39.

In order to lock the rotatable annular plate 206 and the carriagetherein in the selected position, an arrangement is provided, as shownin FIGURE 35. The fourth bolt, nut and washer set 207208--209, whichwould be positioned on the front longitudinally extending bar 265, onthe right of the transverse center line as shown in this figure and intransverse alignment with the set shown, is here omitted and is replacedby a manually operated cam 213a. This feature is shown in detail inFIGURE 38. The cam 213a has a handle 213 therein and is rotatablymounted on a stud bolt 207 having a nut 20S thereon. This stud bolt isreceived in a screw threaded hole in the top flange of the frontlongitudinally extending bar 205 and the cam is arranged to engage withthe lower flange 20Gb on the rotatable annular plate 236 to hold thelatter in the selected position. Additional cams 213a could be appliedto constrain the annular plate 206 or be substituted for any or all ofWashers 209 and nuts 203, if desired.

As shown in phantom lines in FIGURE 34 it is necessary to pull thecarriage and board 4% forward before rotating same, so that they willclear the clutch housings 176-476 (see FIG. 35) while being rotatedthrough 90 degrees. In FIGURE 39 the carriage and board are shown in topplan view in the forward position before being rotated, in phantomlines. After the carriage and board have been pulled forward and rotatedthrough 90 degrees, as shown in full lines, they may be kept in thatposition for convenience in drafting, or pushed rearwardly to positionover the bottom plate 30 above the top 17 of the desk.

The various slides, guides, tracks, channels and other components asherein shown and described do not necessarily limit these particulardesigns of these parts to this invention for shifting the drawing board.

Having now fully described my invention, which I claim as new and usefuland desire to secure by Letters Patent of the United States, from theforegoing it will now be seen that there is herein provided an improvedrotatable and translatable drawing board construction which accomplishesall of the objects of the invention and others including many advantagesof great practical utility and commercial importance.

As many embodiments may be made of this inventive concept, and as manymodifications may be made in the embodiments herein'oefore shown anddescribed, it is to be understood that all matter herein is to beinterpreted merely as illustrative, and not in a limiting sense.

I claim:

1. A drawing board mounting comprised by a carriage arranged to travelover a horizontal surface, a drawing board supported on said carriage,an arrangement of rollers over which the drawing paper is trainedcomprised by a winding roller along one edge of the drawing board, atension roller along the opposite edge of the drawing board, a secondwinding roller intermediate the first winding roller and the tensionroller, parallel .tread members on the opposite sides of said carriage,and supports including parallel plates slidable along the opposite edgesof said parallel tread members and rollers carried by said plates andengaging said parallel tread members.

2. A drawing board mounting comprised by a carriage arranged to travelover a horizontal surface, a drawing board supported on said carriage,an arrangement of rollers over which the drawing paper is trainedcomprised by a winding roller along one edge of the drawing board, atension roller along the opposite edge of the drawing board, a secondwinding roller intermediate the first winding roller and the tensionroller, parallel tread members positioned on the opposite sides of saidcarriage, supports including parallel plates slidable along the oppositeedges of said parallel tread members, stub shafts positioned axially ofsaid parallel plates, rollers carried by said plates and engaging saidparallel tread members, and clutches intermediate said plates and therespective stub shaft.

3. A drawing board mounting comprised by a carriage arranged to travelover a supporting structure, a drawing board supported on said carriage,an arrangement of the opposite sides of said carriage, parallel tread'members mounted on the supporting structure and positioned on theopposite sides of said carriage, supports including parallel plates onthe opposite sides of said parallel tread members and having alignedholes therein receiving said stub shafts, rollers carried by said platesand engaging said parallel tread members, and clutches intermediate saidplates and the respective stub shafts.

4. A drawing board mounting comprised by a carriage arranged to travelover a supporting structure, parallel guides mounted on the carriage, adrawing board supported on said carriage, an arrangement of rollers overwhich the drawing paper is trained comprised by a winding roller alongone edge of the drawing board, a tension roller along the opposite edgeof the drawing board, a second winding roller intermediate the firstwinding roller and the tension roller, stub shafts on the opposite sidesof said carriage, slides movable in said parallel guides, pedestalssecured to said slides and having bores therien for receiving the stubshafts on the carriage and threaded holes therein, and screw threadedshafts received in the screw threaded holes in the pedestals for movingthe pedestals and the slides along the guides.

5. A drawing board mounting comprised by a carriage arranged to travelover a supporting structure, parallel guides mounted on the car-riage, adrawing board supported on said carriage, an arrangement of rollers overwhich the drawing paper is trained comprised by a winding roller alongone edge of the drawing board, a tension roller along the opposite edgeof the drawing board, a second winding roller intermediate the firstwinding roller and the tension roller, stub shafts mounted on theopposite sides of said carriage, slides movable in said parallel guideson the opposite sides of said carriage, pedestals secured to said slidesand having bores therein for receiving the stub shafts on the carriageand threaded holes therein, screw threaded shafts received in the screwthreaded holes in the pedestals for moving the pedestals and the slidesalong the guides, chain sprockets mounted on said screw threaded shaftsand a chain trained over said chain sprockets for conjoint operation ofsaid screw threaded shafts.

6. A drawing board mounting comprised by a carriage arranged to travelover a supporting structure, a drawing board supported by said carriage,an arrangement of rollers over which the drawing paper is trainedcomprised by a winding roller along one edge of the drawing board, atension roller along one edge of the drawing board, a second windingroller intermediate the first winding roller and the tension roller,parallel thread members mounted on the supporting structure andpositioned on the opposite sides of the carriage, stub shafts positionedon the opposite sides of the carriage, parallel guides mounted on theopposite sides of the car-riage, slides movable in said parallel guides,pedestals secured to said slides and having bores therein for receivingthe stub shafts on the carriage, cone clutches comprised byfrosts-conical members on said stub shafts and complementaryfrusto-conical members surrounding said first frusto-conical members,outer frusto-conical members surrounding said complementaryfrusto-conical members and arranged to run on the respective treadmembers, and rollers bearings between said outer frusto-eonical membersand said complementary clutch members.

7. A drawing board mounting comprised by a carriage arranged to travelover a supporting structure, a drawing board supported by said carriage,an arrangement of rollers over which the drawing paper is trainedcomprised by a winding roller along one edge of the drawing board, atension roller along one edge of the drawing board, a second windingroller intermediate the first winding roller and the tension roller,parallel tread members mounted on the supporting structure andpositioned on the opposite sides of the carriage supports includingfirst plates having holes therein adapted to run along one side of saidparallel tread members and second parallel plates having aligned holestherein adapted to run along the other side of said parallel treadmembers, parallel guides mounted on the opposite sides of the carriage,slides movable in the parallel guides, pedestals secured to said slidesand having bores therein for receiving the stub shafts on the carriage,cone clutches comprised by frusto-conical members on said stub shafts,and complementary frustoconical members surrounding said firstfrusto-conical members and received in the holes in said parallelplates, outer frusto-conical members surrounding said complementaryfrusto-conical members and arranged to run on the respective paralleltread members, and roller bearings between said outer frusto-conicalmembers and said complementary clutch members.

8. A drawing board mounting comprised by a carriage arranged to travelover a supporting structure, a drawing board supported by said carriage,an arrangement of rollers over which the drawing paper is trainedcomprised by a winding roller along one edge of the drawing board, atension roller along one edge of the drawing board, a second windingroller intermediate the first winding roller and the tension roller,parallel tread members mounted on the supporting structure andpositioned on the opposite sides of the carriage, supports includingfirst plates having holes therein adapted to run along one side of theparallel tread members and second parallel plates having aligned holestherein adapted to run along the other side of said parallel treadmembers, bal bearings mounted between said parallel plates and arrangedto run on the respective parallel tread members, parallel guides mountedon the opposite sides of the carriage, slides movable in the parallelguides, pedestals secured to said slides and having bores therein forreceiving the stub shafts on the carriage, cone clutches comprised byfrusto-conical members on said stub shafts and complementaryfrusto-eonical members surrounding said first frusto-conical members andreceived in the holes in said parallel plates, outer frusto-conicalmembers surrounding said complementary frusto-conical members andarranged to run on the respective parallel tread members, and rollerbearings between said outer-frusto-conical members and saidcomplementary clutch members.

9. A mounting for supporting a drawing board between parallel surfacescomprised by channel members mounted on said parallel surfaces, platesslidably mounted in said channel members, shafts mounted on said plates,a carriage supporting the drawing board, parallel tracks mounted on thebottom of said carriage, slides movable through the tracks, pedestalsmounted on said slides and receiving said shafts, latch means forsecuring said carriage in a selected position of adjustment, said latchmeans comprising an angle bar, an angle bar having openings therein onone of its slides, a bracket having an opening therein carried by saidbottom of said carriage, and an L-shaped pin extending through saidopening in said bracket and a selected one of said openings in saidangle bar.

References Cited in the file of this patent UNITED STATES PATENTS1,237,170 Cline Aug. 14, 1917 1,258,230 Lewis et a1. Mar. 5, 19181,720,121 Ewald July 9, 1929 1,915,347 Wurm June 27, 1933 2,284,917Nelson June 2, 1942 2,414,606 Page Jan. 21, 1947 2,515,466 Nahmens July18, 1950 2,825,426 Baxter Mar. 4, 1958 2,855,721 Shelly Oct. 14, 19582,896,366 Van Derdys July 28, 1959 2,968,115 Randolph et a1 Jan. 17,1961

1. A DRAWING BOARD MOUNTING COMPRISED BY A CARRIAGE ARRANGED TO TRAVELOVER A HORIZONTAL SURFACE, A DRAWING BOARD SUPPORTED ON SAID CARRIAGE,AN ARRANGEMENT OF ROLLERS OVER WHICH THE DRAWING PAPER IS TRAINEDCOMPRISED BY A WINDING ROLLER ALONG ONE EDGE OF THE DRAWING BOARD, ATENSION ROLLER ALONG THE OPPOSITE EDGE OF THE DRAWING BOARD, A SECONDWINDING ROLLER INTERMEDIATE THE FIRST WINDING ROLLER AND THE TENSIONROLLER, PARALLEL TREAD MEMBERS ON THE OPPOSITE SIDES OF SAID CARRIAGE,AND SUPPORTS INCLUDING PARALLEL PLATES SLIDABLE ALONG THE OPPOSITE EDGESOF SAID PARALLEL TREAD MEMBERS AND ROLLERS CARRIED BY SAID PLATES ANDENGAGING SAID PARALLEL TREAD MEMBERS.